const gulp=require('gulp')
const htmlmin=require('gulp-htmlmin')
const uglify=require('gulp-uglify')
const babel=require('gulp-babel')
const cleanCss=require('gulp-clean-css')
const sass=require('gulp-sass')
const del=require('del')
const connect=require('gulp-connect')
const autoPrefixer = require('gulp-autoprefixer');

const path = {
    html: {
        src: 'src/**/*.html', // src下面的所有文件夹下的所有html文件，下面的js，css以此类推
        dest: 'dist' // 处理的结果放到dist目录
    },
    css: {
        src: 'src/css/**/*.scss', // src下面css目录里的所有文件夹下的所有css文件
        dest: 'dist/css' // 处理的结果放到dist下的css目录里
    },
    js: {
        src: 'src/js/**/*.js',
        dest: 'dist/js'
    },
    img: {
        src: 'src/images/**/*',
        dest: 'dist/images'
    },
    libs: {
        src: 'src/libs/**/*',
        dest: 'dist/libs'
    },
}

const html = () => {
    // 需要把任务代码return
    return gulp.src(path.html.src)
        .pipe(htmlmin({
        	removeComments: true,//清除HTML注释
        	collapseWhitespace: true,//压缩HTML
        	collapseBooleanAttributes: true,//省略布尔属性的值 <input checked="true"/> ==> <input checked />
      		removeEmptyAttributes: true,//删除所有空格作属性值 <input id="" /> ==> <input />
      		removeScriptTypeAttributes: false,//删除<script>的type="text/javascript"
      		removeStyleLinkTypeAttributes: true,//删除<style>和<link>的type="text/css"
      		minifyJS: true,//压缩页面JS
      		minifyCSS: true//压缩页面CSS 
    	}))
        .pipe(gulp.dest(path.html.dest))
        .pipe(connect.reload())
}
const js = () => {
    return gulp.src(path.js.src)
        .pipe(babel({
        	presets: ['@babel/env']
    	}))
        .pipe(uglify())
        .pipe(gulp.dest(path.js.dest))
        .pipe(connect.reload())
}
const css = () => {
    return gulp.src(path.css.src)
        .pipe(sass())
        .pipe(autoPrefixer({
        	presets: ['@babel/env']
    	}))
        .pipe(cleanCss())
        .pipe(gulp.dest(path.css.dest))
        .pipe(connect.reload())
  }
  const server = () => {
    connect.server({
        root: 'dist', // 项目根路径是dist
        livereload: true, // 服务器支持热更新
        port: 2333 // 配置端口号2333
    })
}

const watch = () => {
    gulp.watch(path.html.src, html)
    gulp.watch(path.css.src, css)
    gulp.watch(path.js.src, js)
}
  const clean = () => del('dist')
  const img = () => gulp.src(path.img.src).pipe(gulp.dest(path.img.dest))
  const libs = () => gulp.src(path.libs.src).pipe(gulp.dest(path.libs.dest))
  const ico=()=>gulp.src('src/favicon.ico').pipe(gulp.dest('dist'))
// module.exports = {
//   html,
//   js,
//   css,
//   clean,
//   img,
//   libs,
//   server,
//   watch
// }

module.exports.default = gulp.series(clean, gulp.parallel(html, css, js, img, libs,ico, server, watch))
